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WO2003070453A1 - Procede de production d'element en caoutchouc mince, dispositif de calandrage de caoutchouc, et procede de calandrage de caoutchouc - Google Patents

Procede de production d'element en caoutchouc mince, dispositif de calandrage de caoutchouc, et procede de calandrage de caoutchouc Download PDF

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Publication number
WO2003070453A1
WO2003070453A1 PCT/JP2003/001981 JP0301981W WO03070453A1 WO 2003070453 A1 WO2003070453 A1 WO 2003070453A1 JP 0301981 W JP0301981 W JP 0301981W WO 03070453 A1 WO03070453 A1 WO 03070453A1
Authority
WO
WIPO (PCT)
Prior art keywords
rubber
strip
long
rubber strip
width direction
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/JP2003/001981
Other languages
English (en)
Japanese (ja)
Inventor
Kenji Ogawa
Takehiro Kata
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Bridgestone Corp
Original Assignee
Bridgestone Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from JP2002046811A external-priority patent/JP3983064B2/ja
Priority claimed from JP2002059953A external-priority patent/JP4244279B2/ja
Priority claimed from JP2002129784A external-priority patent/JP4077654B2/ja
Application filed by Bridgestone Corp filed Critical Bridgestone Corp
Priority to DE60325562T priority Critical patent/DE60325562D1/de
Priority to US10/505,118 priority patent/US20050116374A1/en
Priority to EP03707011A priority patent/EP1486320B1/fr
Publication of WO2003070453A1 publication Critical patent/WO2003070453A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C69/00—Combinations of shaping techniques not provided for in a single one of main groups B29C39/00 - B29C67/00, e.g. associations of moulding and joining techniques; Apparatus therefore
    • B29C69/001—Combinations of shaping techniques not provided for in a single one of main groups B29C39/00 - B29C67/00, e.g. associations of moulding and joining techniques; Apparatus therefore a shaping technique combined with cutting, e.g. in parts or slices combined with rearranging and joining the cut parts
    • B29C69/002—Winding
    • B29C69/003—Winding and cutting longitudinally, e.g. for making O-rings; chain links, insulation tubes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
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    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/001—Combinations of extrusion moulding with other shaping operations
    • B29C48/0022—Combinations of extrusion moulding with other shaping operations combined with cutting
    • B—PERFORMING OPERATIONS; TRANSPORTING
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    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
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    • B29C48/08—Flat, e.g. panels flexible, e.g. films
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    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/25—Component parts, details or accessories; Auxiliary operations
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    • B29C48/35—Extrusion nozzles or dies with rollers
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    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/40—General aspects of joining substantially flat articles, e.g. plates, sheets or web-like materials; Making flat seams in tubular or hollow articles; Joining single elements to substantially flat surfaces
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    • B29C66/49—Internally supporting the, e.g. tubular, article during joining
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    • B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
    • B29C66/71—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the composition of the plastics material of the parts to be joined
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    • B29D30/08—Building tyres
    • B29D30/10—Building tyres on round cores, i.e. the shape of the core is approximately identical with the shape of the completed tyre
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2021/00—Use of unspecified rubbers as moulding material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2105/00—Condition, form or state of moulded material or of the material to be shaped
    • B29K2105/25—Solid
    • B29K2105/253—Preform
    • B29K2105/256—Sheets, plates, blanks or films
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2007/00—Flat articles, e.g. films or sheets
    • B29L2007/007—Narrow strips, e.g. ribbons, tapes, bands

Definitions

  • the present invention relates to a method for manufacturing a thin rubber member, and a method for forming a long rubber strip suitable for use in the method for manufacturing a thin rubber member. And a rubber rolling method for forming a long rubber strip suitable for use in the method for producing the thin rubber member.
  • a thin rubber member used for a tire for example, a rubber sheet such as an inner liner is, for example, sheeted by a so-called two-roller die 300 as shown in FIG.
  • 0 3 is the dimension of the seating width W from almost one bead to the other bead toe along the tire inner surface when viewed in a cross section along the tire rotation axis. After that, it was cut to a length equivalent to the perimeter of the inner surface of the evening.
  • both ends in the width direction be tapered to prevent air or liquid from penetrating into the inner surface.
  • both ends are cut obliquely with a cutout 304.
  • the shape of the base 300 was set so that both ends were tapered.
  • one inner liner 1303 obtained in this manner is wound around a drum, and thereafter, tire components such as a carcass ply are sequentially wound to form a raw tire.
  • tire components such as a carcass ply are sequentially wound to form a raw tire.
  • the inner liner 103 is manufactured by such a method, a plurality of mouth ladders having different widths according to the size and type of the tire must be prepared, and the cost of the plant equipment is reduced. It was hanging.
  • a rubber ribbon in the form of a lip is spirally wound around the end face in the width direction so as not to form a gap, so that a step is formed on the surface of the formed rubber sheet, and a concave portion of the step is formed.
  • the air was easy to accumulate, and there was concern about the treatment of the end.
  • the inventor has conducted various trial production studies, and as a result, formed a long rubber strip with tapered sections at both ends in the width direction and overlapped a part of the taper, which was most suitable for inner liners and the like.
  • the change in the amount of unvulcanized rubber discharged to the calendar rolls affects the width of the rolled rubber sheet to be formed, and appears as a width variation.
  • both side edges of the rolled rubber sheet to be formed have tapered portions that are tapered.
  • the rolled rubber sheet fed by the calendar roll 401 is cut into a required shape, and the remaining return rubber 4003 is subjected to kneading.
  • repeated kneading also changes the rubber properties, and it is an operation that we do not want to perform as much as possible in order to stabilize the quality.
  • the rubber bank 504 is placed on the roller head 502 arranged on the rubber discharge side of the rubber extruder 500. Since the mouthpiece 506 of the rubber extruder 500 is only for supplying a certain amount of rubber to the roller head 502, the opening shape is as shown in Fig. 24 (B). In general, a simple circle or a rectangle as shown in FIG. 24 (C) is used.
  • the opening shape of the base 506 was generally a rectangle approximately similar to the roller head profile.
  • the base 506 has a relatively wide cross-sectional shape as shown in FIG. 26 (B).
  • the extruded rubber 5100 is rolled by a roller head 502.
  • the rolling direction (arrow direction: rubber orientation) as shown in Fig. 27 differs between the center straight part (constant thickness part) and the taper part, resulting in post-rolling.
  • the amount of sheet shrinkage becomes tapered and straight
  • the taper portion undulates with the passage of time, and the sheet quality is impaired.
  • the present invention provides a method of manufacturing a thin rubber member capable of manufacturing a thin rubber member having a constant thickness, which is applicable to various sizes, and a method for manufacturing the thin rubber member.
  • An object of the present invention is to provide a rubber rolling device and a rubber rolling method capable of continuously obtaining a long rubber strip having high shape accuracy and quality.
  • the method for manufacturing a thin rubber member according to claim 1, comprising: a first step of forming a sheet-like long rubber strip having tapered portions formed at both ends in a width direction; And a second step of overlapping the tapered portion of the long rubber strip.
  • a sheet-like long rubber strip having tapered portions formed at both ends in the width direction is formed.
  • a thin rubber member is obtained by overlapping the tapered portions of the long rubber strip.
  • a thin rubber member for example, it is possible to manufacture thin rubber members of various sizes by changing the length of a long rubber strip, the number of connections, and the like. By overlapping, a thin rubber member having a constant thickness can be manufactured.
  • the sheet-like long rubber strip having tapered portions formed at both ends in the width direction is set on the sheet surface.
  • the long rubber strip is cut so as to be inclined with respect to the normal line laid on the sheet surface, so that the longitudinal end of the long rubber strip is tapered. Shape.
  • a tapered portion at the width direction end is overlapped, a plurality of strip-shaped rubber strips are connected in the width direction, and a large-area thin rubber member having all the edges tapered is formed. It is formed.
  • the sheet-like long rubber strip having tapered portions formed at both ends in the width direction is cut into a predetermined length.
  • a plurality of strip-shaped rubber strips are connected in the width direction such that the tapered portions at the ends in the width direction are overlapped to obtain a thin rubber member.
  • the thin rubber member is cut so that both ends in the direction intersecting with the connecting direction of the strip-shaped rubber strips are inclined with respect to the normal line formed on the sheet surface.
  • a large-area thin rubber member having all the edges tapered can be obtained.
  • the invention according to claim 4 is the method of manufacturing a thin rubber member according to claim 1, wherein in the second step, the long rubber strip is overlapped with the tapered portion. And spirally wound.
  • the thin rubber member When used as a tire constituent member, the thin rubber member can be used in a cylindrical shape.
  • a long rubber strip is spirally wound around the outer peripheral surface of the drum, and a cylindrical inner liner (thin rubber member) can be formed on the outer peripheral surface of the drum.
  • a tire component such as a bead ring, a car cusp, a side wall rubber, a belt, a tread, or the like can be attached to form a raw tire.
  • the winding start portion and the winding end portion of the long rubber strip are cut into a tapered shape having a gradually narrowing width. , It is characterized.
  • the longitudinal end of the long rubber strip may be cut into a tapered shape before the spiral winding or after the spiral winding.
  • a cylindrical thin rubber obtained by spirally winding the long rubber strip.
  • One or more parts of the member are cut in the axial direction to obtain one or more rubber sheets.
  • One or more rubber sheets are obtained by cutting and developing one or more portions of the cylindrical thin rubber member along the axis.
  • the invention according to claim 7 is a rubber rolling device for continuously forming a long rubber strip used in the method for manufacturing a thin rubber member according to any one of claims 1 to 6.
  • An extruder that extrudes the charged unvulcanized rubber into a flat belt shape from a die, and further forms the flat belt-shaped unvulcanized rubber discharged from the die into a predetermined flat belt-shaped long rubber strip and sends it out.
  • the width of the long rubber strip sent out from the pair of rollers is affected by the amount of unvulcanized rubber discharged from the extruder and the number of rotations of the pair of mouths.
  • the control means controls the discharge amount of the unvulcanized rubber from the extruder and the rotation speed of the pair of rollers so as to be kept constant. Further, the control means controls the pair of rollers so as not to generate re-rubber.
  • a long rubber strip having a predetermined width can be accurately and stably formed and sent out.
  • the invention according to claim 8 is the rubber rolling device according to claim 7, further comprising a width sensor for detecting a width of the long rubber strip sent out from the pair of rollers, wherein the control unit has a predetermined width.
  • the extruder is driven back based on the width of the long rubber strip detected by the width sensor so as to send out the long rubber strip.
  • the control means feedback-controls the driving of the extruder based on the width of the long rubber strip detected by the width sensor, the predetermined width can be obtained without producing re-rubber.
  • the long rubber strip can be accurately and stably formed and sent out.
  • the invention according to claim 9 is the rubber rolling device according to claim 7, wherein the extruder is provided with a fixed-rate discharge pump that feeds the unvulcanized rubber toward the die, and an inlet of the fixed-rate discharge pump.
  • control means performs feedback control of the extruder to maintain the pressure of the unvulcanized rubber extruded from the extruder and reaching the inlet of the fixed-rate discharge pump within a certain range. Therefore, it is possible to easily maintain the shape of the long rubber strip fed from the pair of rollers while maintaining the discharge amount from the constant-rate discharge pump appropriately.
  • a straightening pipe is interposed between the fixed-rate discharge pump and the base to form the unvulcanized rubber into a flat belt shape. Unvulcanized rubber is supplied evenly to the base to be used.
  • the invention according to claim 11 is the rubber rolling device according to claim 7, wherein the base having an opening shape similar to a cross-sectional shape along a width direction of the long rubber strip and the roller A pair of rollers each having a gap portion approximating a cross-sectional shape along a width direction of the long rubber strip; and forming the unvulcanized rubber by the extruder.
  • the control means for controlling at least one of an extrusion amount per unit time and a rotation speed of the pair of rollers so as not to form a bank of unvulcanized rubber on the pair of rollers. .
  • an unvulcanized rubber member is extruded from a die of an extruder.
  • the opening shape of the mouthpiece is similar to the cross-sectional shape along the width direction of a long rubber strip having tapered portions whose thickness gradually decreases toward the width direction end on both sides in the width direction.
  • the cross-sectional shape in the width direction of the unvulcanized rubber member extruded from the die is similar to the cross-sectional shape along the width direction of the long rubber strip (that is, the thickness toward the end in the width direction).
  • the unvulcanized rubber member extruded from the die is rolled by a pair of rotating rollers.
  • the unvulcanized rubber member extruded from the die is similarly rolled in a gap portion similar to the cross-sectional shape along the width direction of the long rubber strip.
  • the control means controls at least one of the amount of unvulcanized rubber extruded by the extruder per unit time and the rotational speed of the pair of rollers so that no bank of unvulcanized rubber is formed on the pair of rollers. I do.
  • the rolling direction (rubber orientation) is uniform across the width, and the amount of sheet shrinkage after rolling is uniform across the width, and the tapered portion after cooling No undulation occurs, and a long rubber strip of good quality having tapered portions whose thickness gradually decreases toward the width direction end portions on both sides in the width direction can be continuously obtained.
  • the invention according to claim 12 is a rubber rolling method for continuously forming a long rubber strip used in the method for producing a thin rubber member according to any one of claims 1 to 6.
  • a step is a rubber rolling method for continuously forming a long rubber strip used in the method for producing a thin rubber member according to any one of claims 1 to 6.
  • an unvulcanized rubber member is extruded from a die of an extruder.
  • the opening shape of the mouthpiece is similar to the cross-sectional shape along the width direction of the long rubber strip provided with tapered portions whose thickness gradually decreases toward the width direction end on both sides in the width direction.
  • the cross-sectional shape of the extruded unvulcanized rubber member in the width direction is similar to the cross-sectional shape along the width direction of the long rubber strip (that is, the taper whose thickness gradually decreases toward the width direction end). Parts are provided on both sides in the width direction).
  • the unvulcanized rubber member extruded from the die is rolled by a pair of rotating rollers.
  • the unvulcanized rubber member extruded from the die is similarly rolled in a gap portion similar to the cross-sectional shape along the width direction of the long rubber strip.
  • the control means controls at least one of the amount of unvulcanized rubber extruded by the extruder per unit time and the rotational speed of the pair of rollers so that no bank of unvulcanized rubber is formed on the pair of rollers. I do.
  • FIG. 1 is a perspective view of an extruder and a roller die.
  • FIG. 2A is a perspective view of the cutting device.
  • FIG. 2B is a side view of the cutting device.
  • FIG. 3 is a perspective view of a cutting device according to another embodiment.
  • FIG. 4 is a perspective view of a cutting device according to still another embodiment.
  • FIG. 5A is a perspective view of the rubber sheet.
  • FIG. 5 (B) is a cross-sectional view of the rubber sheet shown in FIG. 5 (A), taken along line 5 (B) -5 (B).
  • FIG. 5 (C) is a cross-sectional view of the rubber sheet shown in FIG. 5 (A) taken along line 5 (C)-5 (C).
  • FIG. 6 is a perspective view of the drum showing the middle of the winding of the long rubber strip.
  • FIG. 7 is a perspective view of a long rubber strip and a drum after trimming.
  • FIG. 8A is a plan view of the rubber sheet.
  • Fig. 8 (B) is a cross-sectional view of the rubber sheet shown in Fig. 8 (A), taken along the line 8 (B) -8 (B).
  • FIG. 9A is a plan view near the longitudinal end of the long rubber strip.
  • FIG. 9 (B) is a cross-sectional view of the long rubber strip shown in FIG. 9 (A), taken along line 9 (B)-9 (B).
  • FIG. 10 is a perspective view of a long rubber strip according to another embodiment.
  • FIG. 11 is an external perspective view of a rubber rolling device according to one embodiment of the present invention.
  • FIG. 12 is a side view of the rubber rolling device.
  • FIG. 13A is a diagram showing a target cross-sectional shape of the long rubber strip.
  • FIG. 13 (B) is a diagram showing a base shape.
  • FIG. 14 is a block diagram of a control system of the rubber rolling device.
  • FIG. 15 (A) is a side view of a rolling device according to an embodiment of the present invention.
  • FIG. 15 (B) is a cross-sectional view of the unvulcanized rubber discharged from the die along the width direction.
  • FIG. 15 (C) is a cross-sectional view along the width direction of a long rubber strip rolled by a roller head.
  • FIG. 16 is a front view of the base.
  • FIG. 17 is a front view of the roller head.
  • Figure 18 is a block diagram of the electrical system.
  • FIG. 19 is an explanatory diagram showing a rolling direction.
  • FIG. 20 is a perspective view of a two-roller die for manufacturing a conventional inner liner.
  • FIG. 21 is a perspective view of a one-roller die for manufacturing a conventional inner liner.
  • FIG. 22 is a diagram showing a conventional calendar roll with kneading.
  • FIG. 23 is a diagram showing a conventional one-roller die.
  • FIG. 24 (A) is a side view of a conventional rolling device for making a rubber bank.
  • FIG. 24 (B) is a front view of the base.
  • Fig. 24 (C) is a front view of another base.
  • FIG. 24 (D) is a cross-sectional view along the width direction of the rolled rubber sheet rolled by the mouth head.
  • FIG. 25 is a cross-sectional view along the width direction of the rolled rubber sheet on which the protrusion is formed.
  • FIG. 26 (A) is a side view of a conventional rolling device without a rubber bank.
  • FIG. 26 (B) is a cross-sectional view of the unvulcanized rubber discharged from the die along the width direction.
  • Figure 26 (C) shows the width of the rolled rubber sheet rolled by the roller head along the width direction. It is sectional drawing.
  • FIG. 27 is an explanatory view showing the rolling direction in the conventional apparatus.
  • BEST MODE FOR CARRYING OUT THE INVENTION [First Embodiment]
  • a roller die 12 is provided on the discharge port side of the extrusion device 10.
  • the roller die 12 includes an upper roller 14 and a lower roller 16. In the center of the upper roller 14, a wide groove 18 is formed.
  • the groove 18 has a constant depth in the roller axis direction, and the groove walls on both sides are approximately 8
  • the upper roller 14 and the lower roller 16 are configured to be rotated in the direction of an arrow by a driving device (not shown).
  • the extruder 10 extrudes the unvulcanized rubber composition supplied to a hopper (not shown) from a discharge port, and the rubber composition extruded from the discharge port passes through a roller die 12 and has a fixed thickness. Extruded as a strip of rubber strip 20.
  • both sides in the width direction of the long rubber strip 20 extruded from the roller die 12 are tapered portions 2OA which are inclined at approximately 3 ° with respect to the sheet surface.
  • the angle of both sides in the width direction of the long rubber strip 20 is not limited to 3 °, and may be other angles.
  • a cutting device 22 as shown in FIG. 2 is arranged in a direction in which the roller die 12 pushes out the rubber sheet.
  • the cutting device 22 includes an anvil 24 that supports the lower surface of the long rubber strip 20.
  • a rod of a driving device 26 consisting of a cylinder, motor, etc.
  • a cutout 30 connected to 28.
  • the upper surface of the anvil 24 is horizontal, and the blade 3 OA of the cutter 30 is parallel to the upper surface of the anvil 24 and parallel to the width direction of the long rubber strip 20 (to the longitudinal direction). Right angle).
  • the rod 28 moves in the axial direction, and the cutout 30 moves in and out of contact with the anvil 24 at an angle of 45 ° to the longitudinal direction of the long rubber strip 20.
  • a heat sink (not shown) for heating the cut water 30 (for example, 200 to 300 ° C.) is built in the cut water 30.
  • Heating the cut 30 makes it easier to cut the rubber composition.
  • the cutting device according to the present embodiment is a so-called guillotine type cutting device.
  • a cutting device 32 as shown in FIG. 3 is driven by a driving means (not shown) such as a cylinder, a motor or the like to form a long rubber strip 20. It may be cut by sliding in the width direction, and as shown in Fig. 4, a crush cutter 34 whose lower end is set to approximately 90 ° is pressed against a long rubber strip 20 to be cut. Is also good.
  • the long rubber strip 20 is extruded and cut into a predetermined length by the cutting device 22 to form a plurality of strip (rectangular) rubber sheets 36.
  • the length of the strip-shaped rubber sheet 36 is a width dimension (dimension in a direction perpendicular to the tire circumferential direction) as an inner liner of the tire.
  • a plurality of strip-shaped rubber sheets 36 are aligned with a tapered portion in the long direction (a portion cut at 45 °) 36 A, And the tapered part at the end in the width direction (the part extruded at approximately 3 °) 36 B is overlapped with each other, and sequentially connected in the width direction of the strip-shaped rubber sheet 36 to form one unvulcanized sheet.
  • the inner liner is 38.
  • a tapered portion 36 A of a certain strip-shaped rubber sheet 36 has (two points).
  • the tapered portion 36 A of another strip-shaped rubber sheet 36 is overlapped, the tapered portion 36 A of the rubber sheet 36 (shown by a two-dot chain line) which is to be attached later is It is deformed according to the shape of the tapered portion 36 A of the rubber sheet 36 (shown by the solid line) to be pasted, and the surface after pasting is not uneven.
  • the dimension L in FIG. 5 (A) is a dimension in a direction corresponding to the tire circumferential direction.
  • the unvulcanized inner liner 138 thus formed is used for molding a green tire according to a conventional tire manufacturing method.
  • the unvulcanized inner liner 38 is wound around the outer peripheral surface of the band forming drum, and both ends in the circumferential direction are partially overlapped. Then, the carcass ply is placed on the inner liner 38 as before.
  • Various tire components such as bead cores, bead fillers, belts, and treads are attached to complete the raw tire.
  • the inner liner 138 located on the inner surface of the raw tire has a tapered shape at all edges exposed on the inner surface side, which prevents penetration of air and inner surface liquid during vulcanization. it can.
  • a long rubber strip 20 extruded from a roller die 12 firstly has an outer periphery of a drum 40 having a constant diameter rotating in the direction of an arrow. It is spirally wound while the tapered portion 2OA overlaps the surface.
  • both ends of the long rubber strip 20 wound spirally in the drum axial direction are trimmed with a cutter or the like so as to be parallel to the drum circumferential direction.
  • the cut edge is inclined at 45 ° with respect to the sheet surface, and the cut surface is set at 45 ° with respect to the sheet surface.
  • the trimmed cylindrical long rubber strip 20 is cut along the direction of the drum axis with a cutter or the like (indicated by the two-dot chain line in FIG. 7), and is used for one tire as shown in FIG. Get the inner liner one four two.
  • the cut is inclined at 45 ° with respect to the sheet surface, and the cut surface is set at 45 ° with respect to the sheet surface.
  • the inner liner 42 in which all the edges are tapered is obtained.
  • the length and width of the inner liner 142 can be changed according to the tire according to the diameter of the drum 40, the number of cuts in the drum axis direction, and the number of spiral windings.
  • the drum 40 may be prepared in advance with various diameters and a drum 40 suitable for the size of the inner liner 142 may be selected. May be used.
  • the long rubber strip 20 is spirally wound, and then both ends in the drum axis direction are trimmed.
  • the end of the rubber strip 20 in the longitudinal direction is obliquely cut to remove oblique lines, and the longitudinal end is tapered in a plan view, so that when wound spirally, both ends in the drum axial direction
  • the section can be parallel to the drum circumferential direction.
  • the long rubber strip 20 of the present embodiment has a constant thickness in the width direction and tapered portions 2OA formed at both ends in the width direction.
  • the cross-sectional shape of 0 may be a triangle (only the tapered portion 2OA). Even in the case of a long rubber strip 20 with a triangular cross section, the tapered portion 2 OA If the layers are overlapped and spirally wound at a constant pitch, an inner liner having a constant thickness can be formed.
  • the inner liner can be used in a cylindrical shape.
  • a long rubber strip 20 is spirally wound around the outer peripheral surface of the drum to form a cylindrical inner liner on the outer peripheral surface of the drum. Then, on the drum on which the inner liner is formed, a tire component such as a bead ring, a car cusp, a sidewall rubber, a belt, a tread, or the like can be attached to form a raw tire.
  • a tire component such as a bead ring, a car cusp, a sidewall rubber, a belt, a tread, or the like can be attached to form a raw tire.
  • the rubber rolling device 110 according to the present embodiment will be described based on FIGS. 11 to 14.
  • FIG. 11 The rubber rolling device 110 according to the present embodiment will be described based on FIGS. 11 to 14.
  • FIG. 11 The rubber rolling device 110 according to the present embodiment will be described based on FIGS. 11 to 14.
  • FIG. 11 is an external perspective view of a rubber rolling device 110 according to the present embodiment
  • FIG. 12 is a side view thereof.
  • the rubber rolling device 110 is for continuously forming a long rubber strip 101 for forming a thin gauge sheet of a tire component.
  • the long rubber strip 101 is formed in a flat belt shape, and has tapered portions 101 A and 101 A whose both end edges are tapered in a tapered manner.
  • One thin gauge sheet is formed by sequentially overlapping tapered portions 101A with each other.
  • the rubber rolling device 1 10 is composed of an extruder 1 1 1, a gear pump 1 1 2, a straightening tube 1 1 3, a base 1 1 4 base 1 1 5, a calendar roll 1
  • the unvulcanized rubber charged into the extruder 1 1 1 1 is formed and is continuously discharged from the render roll 1 1 6 as a long rubber strip 1 0 1
  • the injected unvulcanized rubber and the like are extruded to the gear pump 112 while kneading by rotating a screw.
  • the gear pump 1 1 2 converts the unvulcanized rubber extruded by the extruder 1 1 1 into a gear. This is a fixed-rate discharge pump that discharges to the rectifier tubes 113 while controlling the discharge amount based on the rotation speed.
  • the rectifier tube 1 1 3 is a distance extension tube that connects the gear pump 1 1 2 and the base 1 1 5 of the head 1 1 4 so that there is an appropriate distance between them, and is interposed as necessary. .
  • the discharge of unvulcanized rubber from the gear pump 111 is often concentrated, so if the distance from the gear pump 111 to the head 114 is short, the rubber is filled into the head 114. Since there is unevenness in the condition, a straightening tube 1 1 3 is interposed between the gear pump 1 1 2 and the base 1 1 5 to eliminate unbalanced filling of unvulcanized rubber into the head 1 14 And can be stabilized.
  • the base 1 15 of the head 1 14 has a base shape substantially similar to the target cross-sectional shape of the long rubber strip 101 to be molded.
  • the target cross-sectional shape of the long rubber strip 101 has a tapered portion 1 O la, 101 a which is flat and has both edges tapered.
  • the base of the base 115 has a tapered portion at both ends as shown in Fig. 13 (B), and the appearance is almost similar to the target cross-sectional shape. are doing. However, the tip of the taper part is missing in the die shape.
  • the tape shape at the both ends of the mouth shape of the mouthpiece 115 also makes the rubber volume more stable by matching the rubber volume.
  • the long rubber strip 101 can be formed.
  • the unvulcanized rubber formed into the shape of the base of the base 115 is discharged between the upper and lower two rolls of the calendar roll 116.
  • the calendar roll 1 16 is formed by sandwiching the unvulcanized rubber discharged from the base 1 15 with upper and lower rolls having a predetermined outer peripheral surface shape and molding it into a target sectional shape to form a final elongated rubber strip 10. Form 1 and send it out continuously.
  • the gear pump 112 In order for the long rubber strip 101 to form the target cross-sectional shape without producing re-formed rubber, the gear pump 112 must be used to form the target cross-sectional shape of the long rubber strip 101. It is necessary that a necessary and sufficient appropriate amount be stably discharged and supplied. However, the discharge amount of the gear pump 112 changes minutely due to temperature changes and minute variations in rubber properties, and this change greatly affects the width of the long rubber strip 101.
  • a sheet width control means 120 for feedback-controlling the width of the long rubber strip 101 discharged from the calendar roll 116 is provided.
  • the present rubber rolling device 110 is a pressure control means 1 for controlling the supply pressure of the unvulcanized rubber for the extruder 111 for supplying the unvulcanized rubber to the gear pump 111. It has 2 5.
  • a pressure sensor 126 is provided at the inlet of the gear pump 112, and the pressure control means 125 controls the extruder 111 based on the detected pressure of the pressure sensor 126, so that the extruder 111 is always fed back. It controls so that unvulcanized rubber is supplied stably at a certain range of pressure.
  • the gear pump 112 to which the unvulcanized rubber is supplied at a certain range of pressure is feedback-controlled by the sheet width control means 120, and monitors the width of the long rubber strip 101 to make small changes.
  • the width accuracy of the long rubber strip 101 can be kept high.
  • the present rubber rolling device 110 can form a long rubber strip 101 having a high-accuracy cross-sectional shape without producing re-contained rubber. Since there is no deterioration in quality and no kneading function is required, it is advantageous in terms of space as a simple and inexpensive facility, and there are few troubles and there is little hindrance to productivity.
  • the seat width control means 20 performs feedback control of the gear pump 112 based on the detection width of the same width sensor 117, and the pressure control means 122 based on the detected pressure of the pressure sensor 126.
  • Has feedback control of the extruder 1 1 1 A long rubber strip with a highly accurate cross-section without producing re-rubber
  • the motor (not shown) that drives the gear pump 112 and the extruder 111 is set to a constant rotation speed (that is, the discharge amount is fixed). B) It may be controlled.
  • a separate control means for controlling the rotation of the motor for driving the calendar roll 116 may be provided, and the rotation of the motor may be controlled based on the detection width of the width sensor 117.
  • the rubber rolling device 210 according to the present embodiment will be described with reference to FIGS. 15 to 19.
  • the rubber rolling device 210 of the present embodiment includes a rubber extruder 2 12.
  • this rubber rolling device 210 has a constant thickness in the widthwise middle portion and tapered portions on both sides that gradually decrease in thickness toward the widthwise end. It is intended to obtain a long rubber strip 242 having an appropriate cross section.
  • the base 2 14 of the rubber extruder 2 12 has a horizontally elongated opening 2 16 as shown in FIG. 16 through which unvulcanized rubber is extruded.
  • the lower edge 2 18 of the opening 2 16 is straight, the upper edge 220 is a straight line whose central portion 220 A is parallel to the lower edge 2 18 and both ends have inclined surfaces 2 20 B is formed. At both ends of the opening 2 16, a vertical portion 2 21 perpendicular to the lower edge 2 18 is formed.
  • the shape of the opening 2 16 is approximately similar to the cross-sectional shape of the long rubber strip 2 42.
  • the opening 2 16 of this embodiment has a width W 1 of 100 nmi, a height HI of the central portion of 1 mm, a height h of the vertical portion 2 21 of 0.5 mm, and a lower edge 2 18.
  • the angle ⁇ 1 of the inclined surface 220B is 3 °.
  • a roller head 222 is provided on the downstream side of the mouthpiece 214 in the rubber extrusion direction.
  • roller heads 2 2 2 It consists of 26.
  • the lower roller 222 has a constant diameter in the axial direction.
  • a groove 228 is formed in the upper roller 224 at an intermediate portion in the axial direction.
  • the groove 228 has a central portion 228A with a constant depth, and both end portions are inclined surfaces 228B with a gradually decreasing depth.
  • the groove width W2 is 98 mm
  • the central groove depth H2 is 0.8 mm
  • the angle ⁇ 2 (with respect to the rotation axis) of the inclined surface is 3 °.
  • the upper roller 222 and the lower roller 222 are in contact with each other at the outer peripheral portion other than the groove 222, and the gap formed by the groove 222 and the lower roller 222 is unvulcanized rubber.
  • the rolling portion is formed into a formed portion 230, and has a shape substantially similar to the cross-sectional shape of the long rubber strip 242.
  • the upper roller 224, the lower roller 226, and the screw 232 of the rubber extruder 221 are each rotated by a motor (not shown).
  • the motor 2 3 4 for rotating the upper roller 2 24 and the lower roller 2 26 and the motor 2 3 6 for rotating the screw 23 2 of the rubber extruder 2 12 are controlled.
  • the control device 238 is connected to the device 238, and controls the rotation speed of the motor 234 and the rotation speed of the motor 236.
  • a sheet-like unvulcanized rubber member 2400 is extruded from an opening 216 of a base 214 of a rubber extruder 2122.
  • the reason why the vertical portion 221 having a height h of 0.5 mm is provided at both ends of the opening 216 is that if the height dimension near both ends (taper tip) is too small, the unvulcanized rubber is completely removed. This is because there is a possibility that a case may not be extruded.
  • the height h of the vertical portion 221 is determined experimentally so that the extrusion can be performed uniformly.
  • the unvulcanized rubber member extruded from the die 214 is rolled by the roller head 222.
  • control device 238 controls the motor 2 36 of the rubber extruder 2 12 and the motor 2 3 4 of the roller head 2 2 2 so that a rubber bank is not formed on the roller head 2 2 2. I do.
  • the unvulcanized rubber member 240 extruded from the base 2 14 is similar to the cross-sectional shape along the width direction of the long rubber strip 2 42, and The strip 242 is rolled in a formed portion 230 slightly smaller than the cross-sectional dimension along the width direction.
  • the rolling direction (arrow in Fig. 19) becomes uniform across the width of the long rubber strip 24, and as a result, Along the width of the long rubber strip 2 4 2, the amount of sheet shrinkage generated after rolling becomes uniform, and the tapered portion does not undulate after cooling, and has a good quality long rubber strip 2 4 2 Is obtained.
  • the method for producing a thin rubber member according to the present invention is suitable for producing, for example, a rubber sheet used as a structural member of a tire, for example, an inner liner.
  • the rubber rolling device and the rubber rolling method according to the present invention include: It is suitable for producing a long strip used in production.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Extrusion Moulding Of Plastics Or The Like (AREA)
  • Tyre Moulding (AREA)
  • Casting Or Compression Moulding Of Plastics Or The Like (AREA)

Abstract

L'invention concerne un procédé de production d'élément en caoutchouc mince applicable à différentes tailles et permettant la fabrication d'un élément en caoutchouc mince d'épaisseur fixe. Dans la première étape, une bande de caoutchouc du type feuille longue comprenant des parties effilées dans les extrémité opposées dans le sens de la largeur, est découpée selon des longueurs fixes pour qu'une ou plusieurs bandes de caoutchouc oblongues (36) soient formées. Dans la deuxième étape, les parties effilées (36B) dans les extrémités dans le sens de la largeur sont superposées de sorte qu'elles soient reliées dans le sens de la largeur aux bandes de caoutchouc oblongues (36), ce qui forme une feuille de caoutchouc (38) de grande surface dont tous les bords terminaux sont effilés. Le changement de la longueur et du nombre de bandes de caoutchouc oblongues (36) à relier permet d'obtenir des feuilles de caoutchouc (38) de tailles différentes.
PCT/JP2003/001981 2002-02-22 2003-02-24 Procede de production d'element en caoutchouc mince, dispositif de calandrage de caoutchouc, et procede de calandrage de caoutchouc Ceased WO2003070453A1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
DE60325562T DE60325562D1 (de) 2002-02-22 2003-02-24 Verfahren zur herstellung eines dünnen kautschukglieds, kautschukwalzvorrichtung und kautschukwalzverfahren
US10/505,118 US20050116374A1 (en) 2002-02-22 2003-02-24 Thin rubber member producing method, rubber rolling device and rubber rolling method
EP03707011A EP1486320B1 (fr) 2002-02-22 2003-02-24 Procede de production d'element en caoutchouc mince, dispositif de calandrage de caoutchouc, et procede de calandrage de caoutchouc

Applications Claiming Priority (6)

Application Number Priority Date Filing Date Title
JP2002046811A JP3983064B2 (ja) 2002-02-22 2002-02-22 ゴムシート成形装置
JP2002-46811 2002-02-22
JP2002-59953 2002-03-06
JP2002059953A JP4244279B2 (ja) 2002-03-06 2002-03-06 ゴムシートの製造方法
JP2002129784A JP4077654B2 (ja) 2002-05-01 2002-05-01 ゴム圧延方法、及びゴム圧延装置
JP2002-129784 2002-05-01

Publications (1)

Publication Number Publication Date
WO2003070453A1 true WO2003070453A1 (fr) 2003-08-28

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PCT/JP2003/001981 Ceased WO2003070453A1 (fr) 2002-02-22 2003-02-24 Procede de production d'element en caoutchouc mince, dispositif de calandrage de caoutchouc, et procede de calandrage de caoutchouc

Country Status (5)

Country Link
US (1) US20050116374A1 (fr)
EP (2) EP2033763B1 (fr)
DE (1) DE60325562D1 (fr)
ES (2) ES2473616T3 (fr)
WO (1) WO2003070453A1 (fr)

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Also Published As

Publication number Publication date
EP1486320A1 (fr) 2004-12-15
US20050116374A1 (en) 2005-06-02
EP2033763B1 (fr) 2014-05-07
ES2473616T3 (es) 2014-07-07
EP1486320A4 (fr) 2005-08-03
EP1486320B1 (fr) 2008-12-31
EP2033763A1 (fr) 2009-03-11
ES2316730T3 (es) 2009-04-16
DE60325562D1 (de) 2009-02-12

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